Nighttime and daytime respiration in a headwater stream
Nighttime and daytime respiration in a headwater stream
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源头河流的夜间和白天呼吸
DOI：
10.1002/eco.1615
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发表时间：
2016
期刊：
影响因子：
2.6
通讯作者：
J. Fleckenstein
中科院分区：
文献类型：
--
作者：
R. González‐Pinzón;Marc Peipoch;R. Haggerty;E. Martí;J. Fleckenstein
我们调查了在夜间和白天的上游流呼吸的变化。为此，我们进行了连续的夜间和白天的实验，注射生物活性示踪剂刃天青在两个河段不同的河岸郁闭度（不同水平的光合有效辐射），比较呼吸速率系数。我们发现，即使在白天和晚上（半天时间尺度）在河床上方测量的河水温度在每个河段和河段之间存在差异（95%置信水平），表观呼吸率系数在夜间和白天条件下没有差异（95%置信水平）。一个可能的解释是，流呼吸的大部分发生在潜流区，流温度和光合有效辐射的昼夜波动大大减弱，在流代谢的常规调查中没有测量温度。我们的研究结果表明，社区呼吸源流可能不需要“校正”白天和夜间之间的温度，即使呼吸的瞬时变化预计会发生从纯生物的角度来看。版权所有© 2015约翰威利父子有限公司.
We investigated changes in respiration across nighttime and daytime in a headwater stream. For this, we conducted consecutive nighttime and daytime experiments injecting the bioreactive tracer resazurin in two reaches with different riparian canopy densities (different levels of photosynthetically active radiation) to compare respiration rate coefficients. We found that even though stream water temperatures measured above the streambed at day and night (half‐day timescale) were different within each reach and across reaches (95% confidence level), apparent respiration rate coefficients were not different across nighttime and daytime conditions (95% confidence level). A likely explanation for this is that the bulk of stream respiration takes place in the hyporheic zone, where diel fluctuations of stream temperature and photosynthetically active radiation are considerably attenuated and where temperature is not measured in routine investigations of stream metabolism. Our results suggest that community respiration in headwater streams may not need to be ‘corrected’ for temperature between daytime and nighttime, even though instantaneous changes in respiration are expected to occur from a pure biological perspective. Copyright © 2015 John Wiley & Sons, Ltd.